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jamesleighe

Minor Define Problem

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I'm trying to allow my error reports to automatically include the file and line number using defines.

Like so:

#define NPERROR( x ) EngineAPI()->Error( __FILE__, __LINE__, x );


Which calls this method:

void Error( const char* file, uintn line, const char* format, ... );


I'm trying to use the define macro like so:

NPERROR( "Chicken named '%s' ate the game code!", chickenName )


However this causes issues because it expects only one parameter in the define and it interprets the commas as new parameters!
How do you think I can fix this while hopefully still including the file and line number automatically?

Thanks as usual!

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Try:

#define NPERROR(...) EngineAPI()->Error( __FILE__, __LINE__, __VA_ARGS__ );

Note variadic macros are a relatively recent C++ language feature, only being standardized in C++11. They've been part of C since C99, and have been widely implemented in C++ as an extension for a while now (ex: MSVC since 2005), but if you're trying to write portable code that targets older compilers, you may want to take a different approach.

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